Grinding machine



Oct. 31, 1933. G. w. BINNS GRINDING MACHINE Filed Dec. 18, 1929 2 Sheets-Sheet 1 Oct. 31, 1933. s w. BINNS GRINDING momma Filed Dec. 18 1929 2 Sheets-Sheet 2 NON Patented Oct. 31, 1933 1,932,952 Germanic mom George W. Binns,

Cincinnati, Ohio, assignor to Cincinnati Grinders Incorporated, Cincinnati, Ohio, a corporation of Ohio Application December 18, 1929 Serial No. 415,074

Claims.

This invention relates to centerless grinding machines and more particularly to a machine having the equivalent of an infeed action without actual reciprocation of either the grinding wheel 5 or the regulating wheel.

In grinding machines of the centerless typethat is, machines wherein the work is not rotated between fixed centers, it is the usual practice to provide a relatively high speed grinding m wheel or disk and a relatively slow speed regulating wheel or disk, arranged substantially in tangential relation to one another, and a work rest blade between the wheels for supporting the work. In some machines of this type, the work 3155 is inserted between the two wheels and held against longitudinal movement while one wheel is moved toward the other to client a reduction in the size of the work piece. Such machines are known as indeed centerless grinders, and it is an object of this invention to provide an improved machine for eilecting this infeed action without bodily movement of either wheel.

Another object of this invention is to provide an improved centerless grinder having an infeed action which will reduce work pieces to a finished size during a single revolution of the regulating wheel.

A further object of this invention is to provide an improved centerless grinder in which the work 39 is automatically removed therefrom by the regulating wheel.

Other objects and advantages of the present invention should be readily apparent by reference to the following specifications, considered in conjunction with the accompanying drawings illustrative of one embodiment thereof, but it will be understood that any modifications in the specific structural details hereinafter disclosed, may be made, within the scope of the appended claims, without departing from or exceeding the spirit of the invention.

In the drawings, in which like reference numerals indicate like parts:

Figure l is a vertical section viewed from one side of the machine;

Figure 2 is an elevation, partly in section, as viewed from the other side of the machine;

Figure 3 is an elevation on the line 33 of Figure 2 Figure 4 is a section on the line 44 of Figure 2;

Figure 5 is a view as taken on the line 5-5 of Figure l;

Figure 6 is a vertical section on the line 6-6 of Figure 5; and

till

Figure 7 is an enlarged detail view on the line 7-7 of Figure 4.

Centerless grinders of the infeed type usually have a relatively large grinding wheel and a small regulating wheel, and to effect reduction in the size of the work, the regulating wheel is gradually moved toward the grinding wheel. The present invention effects the same result by providing a large regulating wheel and a small grinding wheel and forming the periphery of the regulating wheel in a spiral, so that, as the wheel revolves, the constantly increasing radius thereof forces the work toward the grinding wheel to reduce its size.

Referring to the drawings. which represent 7 one embodiment of this invention, the reference numeral 10 indicates the base of the machine having journaled therein the regulating wheel 11 and the adiustably mounted grinding wheel 12. The radius of the periphery of the regulating wheel 11 gradually increases in length from the point A to substantially the point C, which includes the greater portion thereof as indicated by the letter B. llfhe remaining portion C-D of the periphery of the wheel may be concentric with the center. This allows the wheel to effect a reduction in size of the work piece during the greater portion of its revolution and still provides a small concentric portion for cleaning up the work to finished size and allowing the wheel to spark out. The relative proportions of the parts A-IB-C and CD may be varied and it is not intended that this invention should be limited to any specific proportion.

There is provided in the periphery of the regulating wheel, between the points A and D, a work receiving pocket 13. One face 14 of the pocket is so arranged that when the pocket is opposite to the work piece 15 on the blade 16, the work 15 will roll down the inclined face 17 of the blade into the pocket, and the face 18 of the said pocket is at such an angle to the radius of the wheel that when the wheel has rotated in the direction of the arrow, shown in Figure l, substantially 180 degrees, the work piece will roll out of the pocket and down the inclined chute 19 and thus be expelled from the machine.

A truing device has been provided for the regulating wheel and comprises a cam 20 mounted on the axis of the regulating wheel and having a spiral periphery in direct proportion to the periphery of the regulating wheel and located circumferentially thereto so that its smallest radius is in the same radial plane as the smallest radius of the regulating wheel. The roller 21, mounted in the link 22, is provided for engagement with the cam- 20 and the link 22 has a forked end 23 for engagement with the regulating wheel spindle and has the other end pivoted to the vertical slide 24. The slide 24 is dovetailed to engage the bracket 25 mounted on the guard 26 which partially surrounds the regulating wheel. As shown in Figure 6, a spring 2'! is mounted between the slide 24 and adlusting screw 28 threaded in the bracket 25. The spring 27 is provided to maintain the roller 21 in engagement with the cam 20, and the forked end 23 of the link 22 maintains the roller 21 in proper radial relation with the truing mechanism The slide 24 is provided with a dovetailed cross slide 29 in which is adiustably mounted the truing diamond 30. The hand wheel 31 on the end of the screw 32, serves as manual means for reciprocating the cross slide in the well known manner, for truing the wheel.

The grinding wheel 12 is journaled on the slide 33, which is movable toward and from the regulating wheel by means of the handle 34 and screw 35. A guard 36 is also provided for the grinding wheel carried by the slide 33 and has mounted thereon the conventional truing mechanism 37. The work rest blade 16 is mounted on the end of a slide 38 supported by the bed of the machine and in turn supporting the slide 33. A conventional clamping screw, as shown at 39, is provided for locking the slide '38 in adjusted positions.

As it will be noted, the regulatin wheel is fixedly journaled in the machine and, therefore, to compensate for wear of the wheel, the work rest blade 16 is made adjustable toward and from it, and the grinding wheel 12 is also made adjustable for purposes of taking up its wear, as wellas compensating for the wear of the regulating wheel and maintaining the grinding throat at a fixed dimension.

An automatic feeding means has been provided to operate in timed relation with respect to the regulating wheel, and this comprises a maganine 40 in which the work pieces are placed in vertical alignment, side by side. The magazine 40 is open at the bottom so that the bottom piece rests on the work rest blade 16. A plunger 41, engaged by the forked end of the lever 42 which is fixed on one end of the shaft 43, is provided for inserting the work pieces in the grinding throat and the stop 44 is provided on the end of the work rest blade 16 for holding the work inproper grinding position with respect to the two wheels. A bracket 45, mounted on a fixed part of the machine, has a bore 46 which acts as a guiding means for the plunger 41. The shaft 43 is journaled in a fixed part of the machine and is oscillated by means of an arm 4'7, keyed to it, having a roller 48 journaled on the pin 49 fixed in the end of the arm 4'1 and engaging the cam drum 50 mounted on the end of the regulating wheel spindle. A coil spring 51, which has one end attached to a fixed part of the machine, as at 52, surrounds the shaft 43 and has its other end 53 connected to the shaft for constantly urging the roller 48 to the left, as shown in Figure 3. The cam path 50' of the cam drum 50 has the longitudinal portion 54 circumferentially arranged with respect to the pocket in the regulating wheel so that when the work receiving pocket of the regulating wheel is opposite the work rest blade 16 and the work piece thereon has rolled into the said pocket, the plunger 41 will insert a new piece of work into the grinding throat- The operation of the be described, although it should be apparent from the foregoing description. When the machine is started, magazine 40 will be loaded with work pieces and as the longitudinal portion 54 of the cam path comes opposite the roller 48 of the arm 4'1, the spring 51 will actuate the shaft 43, thereby causing the plunger 41 to insert a work piece into the grinding throat. Upon the continued rotation of the regulating wheel, the work piece will be forced against the grinding wheel 12 and reduced in size to its finished diameter. After the regulating' wheel has completed \one revolution, the work receiving pocket 13 in the regulating wheel will come opposite to the work rest and the finished work piece will roll into it. As the regulating wheel continues its movement, the finished work piece will be carried away from the work rest and a new work piece will be inserted. As the grinding wheel operates upon the new work piece, the regulating wheel is at the same time carrying the finished work piece around to the chute 19. It is thus seen that the regulating machine, as a whole, will wheel performs two functions simultaneously, viz.

that of removing the finished work piece from the work rest and of feeding a second work piece into the grinding wheel.

It should be noted that the grinding wheel herein is a commercial size grinding wheel such as ordinarily used on centerless grinders, and that the regulating wheel is an oversize wheel. The size of the regulating wheel depends upon a number of factors. It is well known that a grinding wheel must have a certain peripheral speed, in order to grind properly, and also that at that speed, the grinding wheel will remove a definite amount of stock. The work must therefore make enough revolutions in contact with a grinding wheel having the proper grinding speed, to remove the quantity of stock from the work that is necessary to reduce the work to finished size. Since in centerless grinders, the regulating wheel controls the rotation of the work, it is evident that the regulating wheel herein must have such a size that in one revolution thereof, it will rotate the work a sui'llcient number of times in contact with the grinding wheel, to remove the necessary stock to finish it to size. Thus the size of the regulating wheel depends upon the number of revolutions that must be given to the work piece, which in turn depends upon the speed of the grinding face. Since these factors may vary within certain limits, it is not intended that this invention be limited to any definite relation between them.

What is claimed is:

1. In a truing attachment for an element adapted to rotate on its axis and having an irregular contour, a cam having a similar contour mounted on the axis of the element, truing means arranged to engage the periphery of the element and operative connections between said cam and said truing means to cause the latter to follow the contour of the element.

2.-In a grinding machine having an abrasive wheel of substantially spiral shaped contour, truing means therefor comprising a substantially spiral shaped cam mounted on the axis of the wheel, a radially reciprocating slide, resilient means for moving the slide in one direction, and a link actuated by said cam for moving the slide in opposition to the spring, a cross slide carried by said reciprocating slide having a tool for operating on said wheel to true the same, and means to move said cross slide.

3. In a mechanism for producing a desired peripheral contour on a rotating wheel, the combination with means for rotatably supporting the wheel of a truing device support in fixed relation thereto, a slide carried by the support for movement in a direction toward and from the wheel surface, a pattern member mounted for rotation concentric with the wheel, connections between the pattern member and slide for moving the slide toward and from the wheel as determined by the pattern, a truing member carried by the slide, means for resiliently urging the slide in the direction of the pattern and wheel, and means for varying said resilient urge.

4. In a mechanism for producing a desired peripheral contour on a rotating wheel, the combination with means for rotatably supporting the wheel of a truing device support in fixed relation thereto, a slide carried by the support for movement in a direction toward and from the wheel surface, a pattern member mounted for rotation concentric with the wheel, connections between the pattern member and slide for moving the slide toward and from the wheel as determined by the pattern, a truing member carried by the slide, means for resiliently urging the slide in the direction of the pattern and wheel, means for varying said resilient urge, a supplemental slide carried by the main slide, and a truing tool mounted on the supplemental slide for movement therewith and for adjustment relative thereto.

5. A grinding machine having a base, a rotatable grinding wheel of non-circular contour mounted thereon, a truing apparatus arranged to traverse across the face of the wheel, and a master form which is rotated in synchronism with and on the axis of the wheel to produce a wheel face which is the conjugate of the master form.

6. A machine for grinding work of irregular contour comprising a grinding wheel of a noncircular contour, a truing tool, a movable support for the tool, a master form for controlling the movement of the tool which has a contour similar to that of the finished work, and means for rotating the master form and grinding wheel about co-axial axes.

7. In a mechanism of the class described the combination of a bed,;a spindle rotatably journaled on said bed, a wheel having a circumferential contour secured to said spindle, a guard surrounding the wheel, a trimming mechanism sup ported by said guard for movement toward and laterally of the surface of said wheel, a control member having a circumferential contour similar to that of the wheel and mounted for rotation about an axis co-axial with the spindle, and means connecting the control member with the trimming mechanism whereby the movement of the trimming mechanism toward and from the wheel is efiected to form the circumferential contour on the wheel. v

8. In a mechanism of the class described the combination of a bed, a spindle rotatably journaled on said bed, a wheel having a circumferential contour secured to said spindle, a guard surrounding the wheel, a trimming mechanism supported by said guard for movement toward and laterally of the surface of said wheel, a control member having a circumferential contour similar to that of the wheel and mounted for rotation about an axis co-axial with the spindle, and a link having a pivotal connection with the trimming mechanism and a follower for engagement with the control member whereby rotation of the wheel and control member will through the link eifect the movement of the trimming mechanism toward and from the wheel surface thereby reproducing the contour of the control member on the wheel.

9. In a mechanism of the class described the combination of a bed, a spindle rotatably journaled on said bed, a wheel having a circumferential contour secured to said spindle, a guard surrounding the wheel, a trimming mechanism supported by said guard for movement toward and laterally of the surface of said wheel, a control member having a circumferential contour similar to that of the wheel and mounted for rotation about an axis co-axial with the spindle, a link having a pivoted connection with the trimming mechanism and a follower for engagement with the control member whereby rotation of the wheel and control member will through the link effect the movement of the trimming mechanism toward and from the wheel surface thereby reproducing the contour of the control member on the wheel, and yielding means operable to maintain engagement between the follower and the control member.

10. In a mechanism of the class described the combination of a bed, a spindle rotatably journaled on said bed, a wheel having a circumferential contour secured to said spindle, a guard surrounding the wheel, a trimming mechanism supported by said guard for movement toward and laterally of the surface of said wheel, a control member having a circumferential contour similar to that of the wheel and mounted for rotation about an axis co-axial with the spindle, a link having a pivoted connection with the trimming mechanism and a follower for engagement with the control member whereby rotation of the wheel and control member will through the link effect the movement of the trimming mechanism toward and from the wheel surface thereby reproducing the contour of the control member on the wheel, yielding means operable to maintain engagement between the follower and the control member, and independent means for feeding the "trimming mechanism transversely of the wheel.

GEORGE W. BINNS. 

